<template>
    <div class="wrapper">
        <!-- header -->
        <header>
            <p>商家信息</p>
        </header>

        <!-- LOGO -->
        <div class="business-logo">
            <img :src="business.businessImg" />
        </div>

        <!-- 商家信息 -->
        <div class="business-info">
            <h1>{{ business.businessName }}</h1>
            <p>
                &#165;{{ business.starPrice }}起送 &#165;{{
                    business.deliveryPrice
                }}配送
            </p>
            <p>{{ business.businessExplain }}</p>
        </div>

        <!--  食品列表 -->
        <ul class="food">
            <li v-for="(item, index) in foodArr">
                <div class="food-left">
                    <img :src="item.foodImg" />
                    <div class="food-left-info">
                        <h3>{{ item.foodName }}</h3>
                        <p>{{ item.foodExplain }}</p>
                        <p>&#165;{{ item.foodPrice }}</p>
                    </div>
                </div>
                <div class="food-right">
                    <div>
                        <i
                            class="fa fa-minus-circle"
                            @click="minus(index)"
                            v-show="item.quantity != 0"
                        ></i>
                    </div>
                    <p>
                        <span v-show="item.quantity != 0">{{
                            item.quantity
                        }}</span>
                    </p>
                    <div>
                        <i class="fa fa-plus-circle" @click="add(index)"></i>
                    </div>
                </div>
            </li>
        </ul>

        <!-- 购物车 -->
        <div class="cart">
            <div class="cart-left">
                <div
                    class="cart-left-icon"
                    :style="
                        totalQuantity == 0
                            ? 'background-color:#505051;'
                            : 'background-color:#3190E8;'
                    "
                >
                    <i class="fa fa-shopping-cart"></i>
                    <div
                        class="cart-left-icon-quantity"
                        v-show="totalQuantity != 0"
                    >
                        {{ totalQuantity }}
                    </div>
                </div>
                <div class="cart-left-info">
                    <p>&#165;{{ totalPrice }}</p>
                    <p>另需配送费{{ business.deliveryPrice }}元</p>
                </div>
                <div class="cart-right">
                    <!--不够配送费-->
                    <div
                        class="cart-right-item"
                        v-show="totalSettle < business.starPrice"
                        style="background-color: #535356; cursor: default"
                    >
                        &#165;{{ business.starPrice }}起送
                    </div>
                    <!--达到配送费-->
                    <div
                        class="cart-right-item"
                        @click="toOrder"
                        v-show="totalSettle >= business.starPrice"
                    >
                        去结算
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
export default {
    name: "BusinessInfo",
    data() {
        return {
            businessId: this.$route.query.businessId,
            business: {},
            foodArr: [],
            user: {},
            token: ''
        };
    },
    created() {
        this.user = this.$getSessionStorage("user");
        this.token = this.$getSessionStorage("token");
        //根据businessId查询商家信息
        let url = `BusinessController/getBusinessById/${this.businessId}?token=${this.token}`;
        this.$axios.get(url)
            .then((response) => {
                this.business = response.data.result;
                this.foodArr = this.business.foodList;
                for (let i = 0; i < this.foodArr.length; i++) {
                    this.foodArr[i].quantity = 0;
                }

                //如果已登录，那么需要查询购物车中是否已经选购了某个食品
                if (this.user != null) {
                    this.listCart();
                }
            })
            .catch((error) => {
                console.error(error);
            });
    },
    methods: {
        listCart() {
            this.token = this.$getSessionStorage("token");
            let url = `CartController/listCart/${this.user.userId}?token=${this.token}`;
            this.$axios.get(url).then((response) => {
                    let cartArr = response.data.result;
                    //遍历所有食品列表
                    for (let foodItem of this.foodArr) {
                        foodItem.quantity = 0;
                        for (let cartItem of cartArr) {
                            if (cartItem.foodId == foodItem.foodId) {
                                foodItem.quantity = cartItem.quantity;
                            }
                        }
                    }
                    this.foodArr.sort();
                })
                .catch((error) => {
                    console.error(error);
                });
        },
        add(index) {
            //首先做登录验证
            if (this.user == null) {
                this.$router.push({
                    path: "/login",
                });
                return;
            }

            if (this.foodArr[index].quantity == 0) {
                //做insert
                this.saveCart(index);
            } else {
                //做update
                this.updateCart(index, 1);
            }
        },
        minus(index) {
            //首先做登录验证
            if (this.user == null) {
                this.$router.push({
                    path: "/login",
                });
                return;
            }

            if (this.foodArr[index].quantity > 1) {
                //做update
                this.updateCart(index, -1);
            } else {
                //做delete
                this.removeCart(index);
            }
        },
        saveCart(index) {
            this.token = this.$getSessionStorage("token");
            let url = `CartController/saveCart/${this.user.userId}/${this.businessId}/${this.foodArr[index].foodId}?token=${this.token}`;
            this.$axios.post(url).then((response) => {
                    if (response.data.result == 1) {
                        //此食品数量要更新为1
                        this.foodArr[index].quantity = 1;
                        this.foodArr.sort();
                    } else {
                        alert("向购物车中添加食品失败！");
                    }
                })
                .catch((error) => {
                    console.error(error);
                });
        },
        updateCart(index, num) {
            this.token = this.$getSessionStorage("token");
            let url = `CartController/updateCart/${this.user.userId}/${this.businessId}/${this.foodArr[index].foodId}/${this.foodArr[index].quantity + num}?token=${this.token}`;
            this.$axios.put(url)
                .then((response) => {
                    if (response.data.result == 1) {
                        //此食品数量要更新
                        this.foodArr[index].quantity += num;
                        this.foodArr.sort();
                    } else {
                        console.log(response.data.result);
                        alert("向购物车中更新食品失败！");
                    }
                })
                .catch((error) => {
                    console.error(error);
                });
        },
        removeCart(index) {
            this.token = this.$getSessionStorage("token");
            let url = `CartController/removeCart/${this.user.userId}/${this.businessId}/${this.foodArr[index].foodId}?token=${this.token}`;
            this.$axios.delete(url)
                .then((response) => {
                    if (response.data.result == 1) {
                        //此食品数量要更新为0;视图的减号和数量要消失
                        this.foodArr[index].quantity = 0;
                        this.foodArr.sort();
                    } else {
                        alert("从购物车中删除食品失败！");
                    }
                })
                .catch((error) => {
                    console.error(error);
                });
        },
        toOrder() {
            this.$router.push({
                path: "/orders",
                query: { businessId: this.business.businessId },
            });
        },
    },
    computed: {
        //食品总价格
        totalPrice() {
            let total = 0;
            for (let item of this.foodArr) {
                total = total + item.foodPrice * item.quantity;
            }
            return total.toFixed(2);
        },
        //食品总数量
        totalQuantity() {
            let quantity = 0;
            for (let item of this.foodArr) {
                quantity += item.quantity;
            }
            return quantity;
        },
        //食品结算总价格
        totalSettle() {
            let res = 0;
            res = parseFloat(this.totalPrice + this.business.deliveryPrice);
            return res.toFixed(2);
        },
    },
};
</script>

<style scoped>
/********** 总容器 **********/
.wrapper {
    width: 100%;
    height: 100%;
}

/********** header **********/
.wrapper header {
    width: 100%;
    height: 12vw;
    background-color: #0097ff;
    color: #fff;
    font-size: 4.8vw;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

/***********LOGO***********/
.wrapper .business-logo {
    width: 100%;
    height: 35vw;
    margin-top: 12vw;
    display: flex;
    justify-content: center;
    align-items: center;
}

.wrapper .business-logo img {
    width: 40vw;
    height: 30vw;
    border-radius: 5px;
}

/*******商家信息*********/
.wrapper .business-info {
    width: 100%;
    height: 20vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.wrapper .business-info h1 {
    font-size: 5vw;
}

.wrapper .business-info p {
    font-size: 3vw;
    color: #666;
    margin-top: 1vw;
}

/********食品列表********/
.wrapper .food {
    width: 100%;
    padding-bottom: 14vw;
}

.wrapper .food li {
    width: 100%;
    box-sizing: border-box;
    padding: 2.5vw;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.wrapper .food li .food-left {
    display: flex;
    align-items: center;
}

.wrapper .food li .food-left img {
    width: 20vw;
    height: 20vw;
}

.wrapper .food li .food-left .food-left-info {
    margin-left: 3vw;
}

.wrapper .food li .food-left .food-left-info h3 {
    font-size: 3.8vw;
    color: #555;
}

.wrapper .food li .food-left .food-left-info p {
    font-size: 3vw;
    color: #888;
    margin-top: 2vw;
}

.wrapper .food li .food-right {
    width: 16vw;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.wrapper .food li .food-right .fa-minus-circle {
    font-size: 5.5vw;
    color: #999;
    cursor: pointer;
}

.wrapper .food li .food-right p {
    font-size: 3.6vw;
    color: #333;
}

.wrapper .food li .food-right .fa-plus-circle {
    font-size: 5.5vw;
    color: #0097ef;
    cursor: pointer;
}

/*********购物车********/
.wrapper .cart {
    width: 100%;
    height: 14vw;
    position: fixed;
    left: 0;
    bottom: 0;
    display: flex;
}

.wrapper .cart .cart-left {
    flex: 2;
    background-color: #505051;
    display: flex;
}

.wrapper .cart .cart-left .cart-left-icon {
    width: 16vw;
    height: 16vw;
    box-sizing: border-box;
    border: solid 1.6vw #444;
    border-radius: 8vw;
    background-color: #3190e8;
    font-size: 7vw;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: -4vw;
    margin-left: 3vw;
    position: relative;
}

.wrapper .cart .cart-left .cart-left-icon-quantity {
    width: 5vw;
    height: 5vw;
    border-radius: 2.5vw;
    background-color: red;
    color: #fff;
    font-size: 3.6vw;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    right: -1.5vw;
    top: -1.5vw;
}

.wrapper .cart .cart-left .cart-left-info p:first-child {
    font-size: 4.5vw;
    color: #fff;
    margin-top: 1vw;
}

.wrapper .cart .cart-left .cart-left-info p:last-child {
    font-size: 2.8vw;
    color: #aaa;
}

.wrapper .cart .cart-right {
    flex: 1;
}

/***达到配送费***/
.wrapper .cart .cart-right .cart-right-item {
    width: 50%;
    height: 100%;
    background-color: #38ca73;
    color: #fff;
    font-size: 4.5vw;
    font-weight: 700;
    user-select: none;
    cursor: pointer;
    margin-left: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

/***未达到配送费***/
/*
	.wrapper .cart .cart-right .cart-right-item{
		width: 50%;
		height: 100%;
		background-color: #535356;
		color: #fff;
		font-size: 4.5vw;
		font-weight: 700;
		user-select: none;
		margin-left: 50%;
		display: flex;
		justify-content: center;
		align-items: center;
	}
	*/
</style>
